OK, sometimes this is a legit question.
When my Mazda Protege was getting old, the seatbelt light and beeper would periodically come on anyway, even with the belt fastened. I tried to find where that sound came from... I wanted to smash it with a screwdriver or something... LOL. But I never have had good directional hearing, so I gave up.
After a few months or so I grew numb to this, and it became one of those "old car" things that the next owner can deal with.
It may still have been a motivating factor to finally sell that car, haha